An Efficient One-Pot Synthesis of Substituted 2-Aminothiophenes via Three-Component Gewald Reaction Catalyzed by l-Proline - Wang, Tao; Huang, Xian-Gui; Liu, Jia; Li, Bo; Wu, Jin-Jin; Chen, Kai-Xian; Zhu, Wei-Liang; Xu, Xiao-Yong; Zeng, Bu-Bing (Synlett, 2010)